Raymarine T121 Hull Transmitter

Description

The Raymarine T121 is a wireless hull transmitter for Tacktick Micronet instrument systems. It sits inside the boat and passes hull-mounted sensor information to wireless displays, making it useful when running new data cable through the vessel is difficult. This is an interface unit, not a chartplotter, depth gauge, or standalone wireless display.

The T121 uses proprietary Micronet wireless at 868MHz or 916MHz and needs a 9-24V DC external supply. At only 40mA, it places little load on the boat’s electrical system. The IPX6 housing suits a protected hull-space installation, but the unit still needs a sensible dry mounting location. It has no wired network ports, so compatibility depends on the existing Micronet displays, sensors, and wireless system frequency.

Key Features

• Micronet wireless hull transmitter – Sends compatible sensor data to Raymarine Tacktick displays.
• 868MHz or 916MHz wireless operation – Matches the listed Micronet system frequencies.
• 9-24V DC input – Fits common 12V and 24V boat electrical systems.
• 40mA power draw – Keeps the transmitter’s electrical load low.
• IPX6 housing – Protects the unit in a suitable internal marine installation.

Who Is This For?

This Raymarine wireless instrument interface suits boats using a Tacktick Micronet network where a wired run to the hull is inconvenient. It is not ideal for a new NMEA 2000 installation or a boat without compatible Micronet displays and sensors.

Compatibility

Confirmed compatibility includes Raymarine/Tacktick Micronet wireless displays and sensors operating at the appropriate 868MHz or 916MHz frequency. The supplied information does not identify direct NMEA 2000, NMEA 0183, Garmin, B&G, Simrad, radar, or autopilot compatibility. No named incompatible system was provided; confirm the Micronet frequency and sensor arrangement before installation.

Technical Specifications

• Brand: Raymarine Tacktick
• Model: T121 Wireless Hull Transmitter
• Device type: Wireless instrument interface
• Wireless: Micronet proprietary wireless, 868MHz/916MHz
• Voltage: 9-24V DC external power
• Power draw: 40mA
• Networking: No wired ports
• Water rating: IPX6
• Dimensions: 110 x 114 x 31mm
• Weight: 230g

Warranty & Support

Raymarine provides a 2-year standard warranty, or 3 years with registration as listed in the supplied specifications. Warranty exclusions and service procedures were not provided.

The T121 is useful when a Micronet sailing system needs a wireless link from hull-mounted sensors to cockpit displays. Its advantage is avoiding a long data cable, while the trade-off is a proprietary network and external power requirement. Choose it for an existing Tacktick installation, not as a universal NMEA 2000 gateway.